How do I get archive access to Robinhood Chain?
Several providers offer archive access, including QuickNode, GetBlock, Dwellir, dRPC and Chainstack. You can also run your own — Robinhood publishes the node image, offchainlabs/nitro-node:v3.11.2-3599aca.
An archive node is required for historical state at past blocks: eth_call or eth_getBalance at an old block number needs the state trie at that height, which pruned full nodes discard.
For tokenized equities there is a second requirement that archive access alone does not satisfy. Valuing a past position correctly needs the uiMultiplier as of that block, which means storing the multiplier time series — an archive node gives you the raw balance, not the scaling factor's history.
Because self-hosting is documented and supported, plain archive RPC resale has limited pricing power on this chain.